text: /*
   * Copyright 2008-2018 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include <stdio.h>
  #include BOSS_OPENSSL_U_internal__ctype_h //original-code:"internal/ctype.h"
  #include BOSS_OPENSSL_U_internal__cryptlib_h //original-code:"internal/cryptlib.h"
  #include BOSS_OPENSSL_V_openssl__rand_h //original-code:<openssl/rand.h>
  #include BOSS_OPENSSL_V_openssl__x509_h //original-code:<openssl/x509.h>
  #include BOSS_OPENSSL_V_openssl__asn1_h //original-code:<openssl/asn1.h>
  #include BOSS_OPENSSL_V_openssl__asn1t_h //original-code:<openssl/asn1t.h>
  #include BOSS_OPENSSL_U_internal__evp_int_h //original-code:"internal/evp_int.h"
  #include BOSS_OPENSSL_U_internal__bio_h //original-code:"internal/bio.h"
  #include "asn1_locl.h"
  
  /*
   * Generalised MIME like utilities for streaming ASN1. Although many have a
   * PKCS7/CMS like flavour others are more general purpose.
   */
  
  /*
   * MIME format structures Note that all are translated to lower case apart
   * from parameter values. Quotes are stripped off
   */
  
  struct mime_param_st {
      char *param_name;           /* Param name e.g. "micalg" */
      char *param_value;          /* Param value e.g. "sha1" */
  };
  
  struct mime_header_st {
      char *name;                 /* Name of line e.g. "content-type" */
      char *value;                /* Value of line e.g. "text/plain" */
      STACK_OF(MIME_PARAM) *params; /* Zero or more parameters */
  };
  
  static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
                              const ASN1_ITEM *it);
  static char *strip_ends(char *name);
  static char *strip_start(char *name);
  static char *strip_end(char *name);
  static MIME_HEADER *mime_hdr_new(const char *name, const char *value);
  static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value);
  static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio);
  static int mime_hdr_cmp(const MIME_HEADER *const *a,
                          const MIME_HEADER *const *b);
  static int mime_param_cmp(const MIME_PARAM *const *a,
                            const MIME_PARAM *const *b);
  static void mime_param_free(MIME_PARAM *param);
  static int mime_bound_check(char *line, int linelen, const char *bound, int blen);
  static int multi_split(BIO *bio, const char *bound, STACK_OF(BIO) **ret);
  static int strip_eol(char *linebuf, int *plen, int flags);
  static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name);
  static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name);
  static void mime_hdr_free(MIME_HEADER *hdr);
  
  #define MAX_SMLEN 1024
  #define mime_debug(x)           /* x */
  
  /* Output an ASN1 structure in BER format streaming if necessary */
  
  int i2d_ASN1_bio_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
                          const ASN1_ITEM *it)
  {
      /* If streaming create stream BIO and copy all content through it */
      if (flags & SMIME_STREAM) {
          BIO *bio, *tbio;
          bio = BIO_new_NDEF(out, val, it);
          if (!bio) {
              ASN1err(ASN1_F_I2D_ASN1_BIO_STREAM, ERR_R_MALLOC_FAILURE);
              return 0;
          }
          SMIME_crlf_copy(in, bio, flags);
          (void)BIO_flush(bio);
          /* Free up successive BIOs until we hit the old output BIO */
          do {
              tbio = BIO_pop(bio);
              BIO_free(bio);
              bio = tbio;
          } while (bio != out);
      }
      /*
       * else just write out ASN1 structure which will have all content stored
       * internally
       */
      else
          ASN1_item_i2d_bio(it, out, val);
      return 1;
  }
  
  /* Base 64 read and write of ASN1 structure */
  
  static int B64_write_ASN1(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
                            const ASN1_ITEM *it)
  {
      BIO *b64;
      int r;
      b64 = BIO_new(BIO_f_base64());
      if (b64 == NULL) {
          ASN1err(ASN1_F_B64_WRITE_ASN1, ERR_R_MALLOC_FAILURE);
          return 0;
      }
      /*
       * prepend the b64 BIO so all data is base64 encoded.
       */
      out = BIO_push(b64, out);
      r = i2d_ASN1_bio_stream(out, val, in, flags, it);
      (void)BIO_flush(out);
      BIO_pop(out);
      BIO_free(b64);
      return r;
  }
  
  /* Streaming ASN1 PEM write */
  
  int PEM_write_bio_ASN1_stream(BIO *out, ASN1_VALUE *val, BIO *in, int flags,
                                const char *hdr, const ASN1_ITEM *it)
  {
      int r;
      BIO_printf(out, "-----BEGIN %s-----\n", hdr);
      r = B64_write_ASN1(out, val, in, flags, it);
      BIO_printf(out, "-----END %s-----\n", hdr);
      return r;
  }
  
  static ASN1_VALUE *b64_read_asn1(BIO *bio, const ASN1_ITEM *it)
  {
      BIO *b64;
      ASN1_VALUE *val;
  
      if ((b64 = BIO_new(BIO_f_base64())) == NULL) {
          ASN1err(ASN1_F_B64_READ_ASN1, ERR_R_MALLOC_FAILURE);
          return 0;
      }
      bio = BIO_push(b64, bio);
      val = ASN1_item_d2i_bio(it, bio, NULL);
      if (!val)
          ASN1err(ASN1_F_B64_READ_ASN1, ASN1_R_DECODE_ERROR);
      (void)BIO_flush(bio);
      BIO_pop(bio);
      BIO_free(b64);
      return val;
  }
  
  /* Generate the MIME "micalg" parameter from RFC3851, RFC4490 */
  
  static int asn1_write_micalg(BIO *out, STACK_OF(X509_ALGOR) *mdalgs)
  {
      const EVP_MD *md;
      int i, have_unknown = 0, write_comma, ret = 0, md_nid;
      have_unknown = 0;
      write_comma = 0;
      for (i = 0; i < sk_X509_ALGOR_num(mdalgs); i++) {
          if (write_comma)
              BIO_write(out, ",", 1);
          write_comma = 1;
          md_nid = OBJ_obj2nid(sk_X509_ALGOR_value(mdalgs, i)->algorithm);
          md = EVP_get_digestbynid(md_nid);
          if (md && md->md_ctrl) {
              int rv;
              char *micstr;
              rv = md->md_ctrl(NULL, EVP_MD_CTRL_MICALG, 0, &micstr);
              if (rv > 0) {
                  BIO_puts(out, micstr);
                  OPENSSL_free(micstr);
                  continue;
              }
              if (rv != -2)
                  goto err;
          }
          switch (md_nid) {
          case NID_sha1:
              BIO_puts(out, "sha1");
              break;
  
          case NID_md5:
              BIO_puts(out, "md5");
              break;
  
          case NID_sha256:
              BIO_puts(out, "sha-256");
              break;
  
          case NID_sha384:
              BIO_puts(out, "sha-384");
              break;
  
          case NID_sha512:
              BIO_puts(out, "sha-512");
              break;
  
          case NID_id_GostR3411_94:
              BIO_puts(out, "gostr3411-94");
              goto err;
  
          default:
              if (have_unknown)
                  write_comma = 0;
              else {
                  BIO_puts(out, "unknown");
                  have_unknown = 1;
              }
              break;
  
          }
      }
  
      ret = 1;
   err:
  
      return ret;
  
  }
  
  /* SMIME sender */
  
  int SMIME_write_ASN1(BIO *bio, ASN1_VALUE *val, BIO *data, int flags,
                       int ctype_nid, int econt_nid,
                       STACK_OF(X509_ALGOR) *mdalgs, const ASN1_ITEM *it)
  {
      char bound[33], c;
      int i;
      const char *mime_prefix, *mime_eol, *cname = "smime.p7m";
      const char *msg_type = NULL;
      if (flags & SMIME_OLDMIME)
          mime_prefix = "application/x-pkcs7-";
      else
          mime_prefix = "application/pkcs7-";
  
      if (flags & SMIME_CRLFEOL)
          mime_eol = "\r\n";
      else
          mime_eol = "\n";
      if ((flags & SMIME_DETACHED) && data) {
          /* We want multipart/signed */
          /* Generate a random boundary */
          if (RAND_bytes((unsigned char *)bound, 32) <= 0)
              return 0;
          for (i = 0; i < 32; i++) {
              c = bound[i] & 0xf;
              if (c < 10)
                  c += '0';
              else
                  c += 'A' - 10;
              bound[i] = c;
          }
          bound[32] = 0;
          BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
          BIO_printf(bio, "Content-Type: multipart/signed;");
          BIO_printf(bio, " protocol=\"%ssignature\";", mime_prefix);
          BIO_puts(bio, " micalg=\"");
          asn1_write_micalg(bio, mdalgs);
          BIO_printf(bio, "\"; boundary=\"----%s\"%s%s",
                     bound, mime_eol, mime_eol);
          BIO_printf(bio, "This is an S/MIME signed message%s%s",
                     mime_eol, mime_eol);
          /* Now write out the first part */
          BIO_printf(bio, "------%s%s", bound, mime_eol);
          if (!asn1_output_data(bio, data, val, flags, it))
              return 0;
          BIO_printf(bio, "%s------%s%s", mime_eol, bound, mime_eol);
  
          /* Headers for signature */
  
          BIO_printf(bio, "Content-Type: %ssignature;", mime_prefix);
          BIO_printf(bio, " name=\"smime.p7s\"%s", mime_eol);
          BIO_printf(bio, "Content-Transfer-Encoding: base64%s", mime_eol);
          BIO_printf(bio, "Content-Disposition: attachment;");
          BIO_printf(bio, " filename=\"smime.p7s\"%s%s", mime_eol, mime_eol);
          B64_write_ASN1(bio, val, NULL, 0, it);
          BIO_printf(bio, "%s------%s--%s%s", mime_eol, bound,
                     mime_eol, mime_eol);
          return 1;
      }
  
      /* Determine smime-type header */
  
      if (ctype_nid == NID_pkcs7_enveloped)
          msg_type = "enveloped-data";
      else if (ctype_nid == NID_pkcs7_signed) {
          if (econt_nid == NID_id_smime_ct_receipt)
              msg_type = "signed-receipt";
          else if (sk_X509_ALGOR_num(mdalgs) >= 0)
              msg_type = "signed-data";
          else
              msg_type = "certs-only";
      } else if (ctype_nid == NID_id_smime_ct_compressedData) {
          msg_type = "compressed-data";
          cname = "smime.p7z";
      }
      /* MIME headers */
      BIO_printf(bio, "MIME-Version: 1.0%s", mime_eol);
      BIO_printf(bio, "Content-Disposition: attachment;");
      BIO_printf(bio, " filename=\"%s\"%s", cname, mime_eol);
      BIO_printf(bio, "Content-Type: %smime;", mime_prefix);
      if (msg_type)
          BIO_printf(bio, " smime-type=%s;", msg_type);
      BIO_printf(bio, " name=\"%s\"%s", cname, mime_eol);
      BIO_printf(bio, "Content-Transfer-Encoding: base64%s%s",
                 mime_eol, mime_eol);
      if (!B64_write_ASN1(bio, val, data, flags, it))
          return 0;
      BIO_printf(bio, "%s", mime_eol);
      return 1;
  }
  
  /* Handle output of ASN1 data */
  
  static int asn1_output_data(BIO *out, BIO *data, ASN1_VALUE *val, int flags,
                              const ASN1_ITEM *it)
  {
      BIO *tmpbio;
      const ASN1_AUX *aux = it->funcs;
      ASN1_STREAM_ARG sarg;
      int rv = 1;
  
      /*
       * If data is not detached or resigning then the output BIO is already
       * set up to finalise when it is written through.
       */
      if (!(flags & SMIME_DETACHED) || (flags & PKCS7_REUSE_DIGEST)) {
          SMIME_crlf_copy(data, out, flags);
          return 1;
      }
  
      if (!aux || !aux->asn1_cb) {
          ASN1err(ASN1_F_ASN1_OUTPUT_DATA, ASN1_R_STREAMING_NOT_SUPPORTED);
          return 0;
      }
  
      sarg.out = out;
      sarg.ndef_bio = NULL;
      sarg.boundary = NULL;
  
      /* Let ASN1 code prepend any needed BIOs */
  
      if (aux->asn1_cb(ASN1_OP_DETACHED_PRE, &val, it, &sarg) <= 0)
          return 0;
  
      /* Copy data across, passing through filter BIOs for processing */
      SMIME_crlf_copy(data, sarg.ndef_bio, flags);
  
      /* Finalize structure */
      if (aux->asn1_cb(ASN1_OP_DETACHED_POST, &val, it, &sarg) <= 0)
          rv = 0;
  
      /* Now remove any digests prepended to the BIO */
  
      while (sarg.ndef_bio != out) {
          tmpbio = BIO_pop(sarg.ndef_bio);
          BIO_free(sarg.ndef_bio);
          sarg.ndef_bio = tmpbio;
      }
  
      return rv;
  
  }
  
  /*
   * SMIME reader: handle multipart/signed and opaque signing. in multipart
   * case the content is placed in a memory BIO pointed to by "bcont". In
   * opaque this is set to NULL
   */
  
  ASN1_VALUE *SMIME_read_ASN1(BIO *bio, BIO **bcont, const ASN1_ITEM *it)
  {
      BIO *asnin;
      STACK_OF(MIME_HEADER) *headers = NULL;
      STACK_OF(BIO) *parts = NULL;
      MIME_HEADER *hdr;
      MIME_PARAM *prm;
      ASN1_VALUE *val;
      int ret;
  
      if (bcont)
          *bcont = NULL;
  
      if ((headers = mime_parse_hdr(bio)) == NULL) {
          ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_PARSE_ERROR);
          return NULL;
      }
  
      if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
          || hdr->value == NULL) {
          sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
          ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_CONTENT_TYPE);
          return NULL;
      }
  
      /* Handle multipart/signed */
  
      if (strcmp(hdr->value, "multipart/signed") == 0) {
          /* Split into two parts */
          prm = mime_param_find(hdr, "boundary");
          if (!prm || !prm->param_value) {
              sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
              ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BOUNDARY);
              return NULL;
          }
          ret = multi_split(bio, prm->param_value, &parts);
          sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
          if (!ret || (sk_BIO_num(parts) != 2)) {
              ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_MULTIPART_BODY_FAILURE);
              sk_BIO_pop_free(parts, BIO_vfree);
              return NULL;
          }
  
          /* Parse the signature piece */
          asnin = sk_BIO_value(parts, 1);
  
          if ((headers = mime_parse_hdr(asnin)) == NULL) {
              ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_MIME_SIG_PARSE_ERROR);
              sk_BIO_pop_free(parts, BIO_vfree);
              return NULL;
          }
  
          /* Get content type */
  
          if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
              || hdr->value == NULL) {
              sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
              ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_NO_SIG_CONTENT_TYPE);
              sk_BIO_pop_free(parts, BIO_vfree);
              return NULL;
          }
  
          if (strcmp(hdr->value, "application/x-pkcs7-signature") &&
              strcmp(hdr->value, "application/pkcs7-signature")) {
              ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_SIG_INVALID_MIME_TYPE);
              ERR_add_error_data(2, "type: ", hdr->value);
              sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
              sk_BIO_pop_free(parts, BIO_vfree);
              return NULL;
          }
          sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
          /* Read in ASN1 */
          if ((val = b64_read_asn1(asnin, it)) == NULL) {
              ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_SIG_PARSE_ERROR);
              sk_BIO_pop_free(parts, BIO_vfree);
              return NULL;
          }
  
          if (bcont) {
              *bcont = sk_BIO_value(parts, 0);
              BIO_free(asnin);
              sk_BIO_free(parts);
          } else
              sk_BIO_pop_free(parts, BIO_vfree);
          return val;
      }
  
      /* OK, if not multipart/signed try opaque signature */
  
      if (strcmp(hdr->value, "application/x-pkcs7-mime") &&
          strcmp(hdr->value, "application/pkcs7-mime")) {
          ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_INVALID_MIME_TYPE);
          ERR_add_error_data(2, "type: ", hdr->value);
          sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
          return NULL;
      }
  
      sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
  
      if ((val = b64_read_asn1(bio, it)) == NULL) {
          ASN1err(ASN1_F_SMIME_READ_ASN1, ASN1_R_ASN1_PARSE_ERROR);
          return NULL;
      }
      return val;
  
  }
  
  /* Copy text from one BIO to another making the output CRLF at EOL */
  int SMIME_crlf_copy(BIO *in, BIO *out, int flags)
  {
      BIO *bf;
      char eol;
      int len;
      char linebuf[MAX_SMLEN];
      /*
       * Buffer output so we don't write one line at a time. This is useful
       * when streaming as we don't end up with one OCTET STRING per line.
       */
      bf = BIO_new(BIO_f_buffer());
      if (bf == NULL)
          return 0;
      out = BIO_push(bf, out);
      if (flags & SMIME_BINARY) {
          while ((len = BIO_read(in, linebuf, MAX_SMLEN)) > 0)
              BIO_write(out, linebuf, len);
      } else {
          int eolcnt = 0;
          if (flags & SMIME_TEXT)
              BIO_printf(out, "Content-Type: text/plain\r\n\r\n");
          while ((len = BIO_gets(in, linebuf, MAX_SMLEN)) > 0) {
              eol = strip_eol(linebuf, &len, flags);
              if (len) {
                  /* Not EOF: write out all CRLF */
                  if (flags & SMIME_ASCIICRLF) {
                      int i;
                      for (i = 0; i < eolcnt; i++)
                          BIO_write(out, "\r\n", 2);
                      eolcnt = 0;
                  }
                  BIO_write(out, linebuf, len);
                  if (eol)
                      BIO_write(out, "\r\n", 2);
              } else if (flags & SMIME_ASCIICRLF)
                  eolcnt++;
              else if (eol)
                  BIO_write(out, "\r\n", 2);
          }
      }
      (void)BIO_flush(out);
      BIO_pop(out);
      BIO_free(bf);
      return 1;
  }
  
  /* Strip off headers if they are text/plain */
  int SMIME_text(BIO *in, BIO *out)
  {
      char iobuf[4096];
      int len;
      STACK_OF(MIME_HEADER) *headers;
      MIME_HEADER *hdr;
  
      if ((headers = mime_parse_hdr(in)) == NULL) {
          ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_PARSE_ERROR);
          return 0;
      }
      if ((hdr = mime_hdr_find(headers, "content-type")) == NULL
          || hdr->value == NULL) {
          ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_MIME_NO_CONTENT_TYPE);
          sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
          return 0;
      }
      if (strcmp(hdr->value, "text/plain")) {
          ASN1err(ASN1_F_SMIME_TEXT, ASN1_R_INVALID_MIME_TYPE);
          ERR_add_error_data(2, "type: ", hdr->value);
          sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
          return 0;
      }
      sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
      while ((len = BIO_read(in, iobuf, sizeof(iobuf))) > 0)
          BIO_write(out, iobuf, len);
      if (len < 0)
          return 0;
      return 1;
  }
  
  /*
   * Split a multipart/XXX message body into component parts: result is
   * canonical parts in a STACK of bios
   */
  
  static int multi_split(BIO *bio, const char *bound, STACK_OF(BIO) **ret)
  {
      char linebuf[MAX_SMLEN];
      int len, blen;
      int eol = 0, next_eol = 0;
      BIO *bpart = NULL;
      STACK_OF(BIO) *parts;
      char state, part, first;
  
      blen = strlen(bound);
      part = 0;
      state = 0;
      first = 1;
      parts = sk_BIO_new_null();
      *ret = parts;
      if (*ret == NULL)
          return 0;
      while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
          state = mime_bound_check(linebuf, len, bound, blen);
          if (state == 1) {
              first = 1;
              part++;
          } else if (state == 2) {
              if (!sk_BIO_push(parts, bpart)) {
                  BIO_free(bpart);
                  return 0;
              }
              return 1;
          } else if (part) {
              /* Strip CR+LF from linebuf */
              next_eol = strip_eol(linebuf, &len, 0);
              if (first) {
                  first = 0;
                  if (bpart)
                      if (!sk_BIO_push(parts, bpart)) {
                          BIO_free(bpart);
                          return 0;
                      }
                  bpart = BIO_new(BIO_s_mem());
                  if (bpart == NULL)
                      return 0;
                  BIO_set_mem_eof_return(bpart, 0);
              } else if (eol)
                  BIO_write(bpart, "\r\n", 2);
              eol = next_eol;
              if (len)
                  BIO_write(bpart, linebuf, len);
          }
      }
      BIO_free(bpart);
      return 0;
  }
  
  /* This is the big one: parse MIME header lines up to message body */
  
  #define MIME_INVALID    0
  #define MIME_START      1
  #define MIME_TYPE       2
  #define MIME_NAME       3
  #define MIME_VALUE      4
  #define MIME_QUOTE      5
  #define MIME_COMMENT    6
  
  static STACK_OF(MIME_HEADER) *mime_parse_hdr(BIO *bio)
  {
      char *p, *q, c;
      char *ntmp;
      char linebuf[MAX_SMLEN];
      MIME_HEADER *mhdr = NULL, *new_hdr = NULL;
      STACK_OF(MIME_HEADER) *headers;
      int len, state, save_state = 0;
  
      headers = sk_MIME_HEADER_new(mime_hdr_cmp);
      if (headers == NULL)
          return NULL;
      while ((len = BIO_gets(bio, linebuf, MAX_SMLEN)) > 0) {
          /* If whitespace at line start then continuation line */
          if (mhdr && ossl_isspace(linebuf[0]))
              state = MIME_NAME;
          else
              state = MIME_START;
          ntmp = NULL;
          /* Go through all characters */
          for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
               p++) {
  
              /*
               * State machine to handle MIME headers if this looks horrible
               * that's because it *is*
               */
  
              switch (state) {
              case MIME_START:
                  if (c == ':') {
                      state = MIME_TYPE;
                      *p = 0;
                      ntmp = strip_ends(q);
                      q = p + 1;
                  }
                  break;
  
              case MIME_TYPE:
                  if (c == ';') {
                      mime_debug("Found End Value\n");
                      *p = 0;
                      new_hdr = mime_hdr_new(ntmp, strip_ends(q));
                      if (new_hdr == NULL)
                          goto err;
                      if (!sk_MIME_HEADER_push(headers, new_hdr))
                          goto err;
                      mhdr = new_hdr;
                      new_hdr = NULL;
                      ntmp = NULL;
                      q = p + 1;
                      state = MIME_NAME;
                  } else if (c == '(') {
                      save_state = state;
                      state = MIME_COMMENT;
                  }
                  break;
  
              case MIME_COMMENT:
                  if (c == ')') {
                      state = save_state;
                  }
                  break;
  
              case MIME_NAME:
                  if (c == '=') {
                      state = MIME_VALUE;
                      *p = 0;
                      ntmp = strip_ends(q);
                      q = p + 1;
                  }
                  break;
  
              case MIME_VALUE:
                  if (c == ';') {
                      state = MIME_NAME;
                      *p = 0;
                      mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
                      ntmp = NULL;
                      q = p + 1;
                  } else if (c == '"') {
                      mime_debug("Found Quote\n");
                      state = MIME_QUOTE;
                  } else if (c == '(') {
                      save_state = state;
                      state = MIME_COMMENT;
                  }
                  break;
  
              case MIME_QUOTE:
                  if (c == '"') {
                      mime_debug("Found Match Quote\n");
                      state = MIME_VALUE;
                  }
                  break;
              }
          }
  
          if (state == MIME_TYPE) {
              new_hdr = mime_hdr_new(ntmp, strip_ends(q));
              if (new_hdr == NULL)
                  goto err;
              if (!sk_MIME_HEADER_push(headers, new_hdr))
                  goto err;
              mhdr = new_hdr;
              new_hdr = NULL;
          } else if (state == MIME_VALUE)
              mime_hdr_addparam(mhdr, ntmp, strip_ends(q));
          if (p == linebuf)
              break;              /* Blank line means end of headers */
      }
  
      return headers;
  
  err:
      mime_hdr_free(new_hdr);
      sk_MIME_HEADER_pop_free(headers, mime_hdr_free);
      return NULL;
  }
  
  static char *strip_ends(char *name)
  {
      return strip_end(strip_start(name));
  }
  
  /* Strip a parameter of whitespace from start of param */
  static char *strip_start(char *name)
  {
      char *p, c;
      /* Look for first non white space or quote */
      for (p = name; (c = *p); p++) {
          if (c == '"') {
              /* Next char is start of string if non null */
              if (p[1])
                  return p + 1;
              /* Else null string */
              return NULL;
          }
          if (!ossl_isspace(c))
              return p;
      }
      return NULL;
  }
  
  /* As above but strip from end of string : maybe should handle brackets? */
  static char *strip_end(char *name)
  {
      char *p, c;
      if (!name)
          return NULL;
      /* Look for first non white space or quote */
      for (p = name + strlen(name) - 1; p >= name; p--) {
          c = *p;
          if (c == '"') {
              if (p - 1 == name)
                  return NULL;
              *p = 0;
              return name;
          }
          if (ossl_isspace(c))
              *p = 0;
          else
              return name;
      }
      return NULL;
  }
  
  static MIME_HEADER *mime_hdr_new(const char *name, const char *value)
  {
      MIME_HEADER *mhdr = NULL;
      char *tmpname = NULL, *tmpval = NULL, *p;
  
      if (name) {
          if ((tmpname = OPENSSL_strdup(name)) == NULL)
              return NULL;
          for (p = tmpname; *p; p++)
              *p = ossl_tolower(*p);
      }
      if (value) {
          if ((tmpval = OPENSSL_strdup(value)) == NULL)
              goto err;
          for (p = tmpval; *p; p++)
              *p = ossl_tolower(*p);
      }
      mhdr = OPENSSL_malloc(sizeof(*mhdr));
      if (mhdr == NULL)
          goto err;
      mhdr->name = tmpname;
      mhdr->value = tmpval;
      if ((mhdr->params = sk_MIME_PARAM_new(mime_param_cmp)) == NULL)
          goto err;
      return mhdr;
  
   err:
      OPENSSL_free(tmpname);
      OPENSSL_free(tmpval);
      OPENSSL_free(mhdr);
      return NULL;
  }
  
  static int mime_hdr_addparam(MIME_HEADER *mhdr, const char *name, const char *value)
  {
      char *tmpname = NULL, *tmpval = NULL, *p;
      MIME_PARAM *mparam = NULL;
  
      if (name) {
          tmpname = OPENSSL_strdup(name);
          if (!tmpname)
              goto err;
          for (p = tmpname; *p; p++)
              *p = ossl_tolower(*p);
      }
      if (value) {
          tmpval = OPENSSL_strdup(value);
          if (!tmpval)
              goto err;
      }
      /* Parameter values are case sensitive so leave as is */
      mparam = OPENSSL_malloc(sizeof(*mparam));
      if (mparam == NULL)
          goto err;
      mparam->param_name = tmpname;
      mparam->param_value = tmpval;
      if (!sk_MIME_PARAM_push(mhdr->params, mparam))
          goto err;
      return 1;
   err:
      OPENSSL_free(tmpname);
      OPENSSL_free(tmpval);
      OPENSSL_free(mparam);
      return 0;
  }
  
  static int mime_hdr_cmp(const MIME_HEADER *const *a,
                          const MIME_HEADER *const *b)
  {
      if (!(*a)->name || !(*b)->name)
          return ! !(*a)->name - ! !(*b)->name;
  
      return strcmp((*a)->name, (*b)->name);
  }
  
  static int mime_param_cmp(const MIME_PARAM *const *a,
                            const MIME_PARAM *const *b)
  {
      if (!(*a)->param_name || !(*b)->param_name)
          return ! !(*a)->param_name - ! !(*b)->param_name;
      return strcmp((*a)->param_name, (*b)->param_name);
  }
  
  /* Find a header with a given name (if possible) */
  
  static MIME_HEADER *mime_hdr_find(STACK_OF(MIME_HEADER) *hdrs, const char *name)
  {
      MIME_HEADER htmp;
      int idx;
  
      htmp.name = (char *)name;
      htmp.value = NULL;
      htmp.params = NULL;
  
      idx = sk_MIME_HEADER_find(hdrs, &htmp);
      return sk_MIME_HEADER_value(hdrs, idx);
  }
  
  static MIME_PARAM *mime_param_find(MIME_HEADER *hdr, const char *name)
  {
      MIME_PARAM param;
      int idx;
  
      param.param_name = (char *)name;
      param.param_value = NULL;
      idx = sk_MIME_PARAM_find(hdr->params, &param);
      return sk_MIME_PARAM_value(hdr->params, idx);
  }
  
  static void mime_hdr_free(MIME_HEADER *hdr)
  {
      if (hdr == NULL)
          return;
      OPENSSL_free(hdr->name);
      OPENSSL_free(hdr->value);
      if (hdr->params)
          sk_MIME_PARAM_pop_free(hdr->params, mime_param_free);
      OPENSSL_free(hdr);
  }
  
  static void mime_param_free(MIME_PARAM *param)
  {
      OPENSSL_free(param->param_name);
      OPENSSL_free(param->param_value);
      OPENSSL_free(param);
  }
  
  /*-
   * Check for a multipart boundary. Returns:
   * 0 : no boundary
   * 1 : part boundary
   * 2 : final boundary
   */
  static int mime_bound_check(char *line, int linelen, const char *bound, int blen)
  {
      if (linelen == -1)
          linelen = strlen(line);
      if (blen == -1)
          blen = strlen(bound);
      /* Quickly eliminate if line length too short */
      if (blen + 2 > linelen)
          return 0;
      /* Check for part boundary */
      if ((strncmp(line, "--", 2) == 0)
          && strncmp(line + 2, bound, blen) == 0) {
          if (strncmp(line + blen + 2, "--", 2) == 0)
              return 2;
          else
              return 1;
      }
      return 0;
  }
  
  static int strip_eol(char *linebuf, int *plen, int flags)
  {
      int len = *plen;
      char *p, c;
      int is_eol = 0;
  
      for (p = linebuf + len - 1; len > 0; len--, p--) {
          c = *p;
          if (c == '\n') {
              is_eol = 1;
          } else if (is_eol && flags & SMIME_ASCIICRLF && c == 32) {
              /* Strip trailing space on a line; 32 == ASCII for ' ' */
              continue;
          } else if (c != '\r') {
              break;
          }
      }
      *plen = len;
      return is_eol;
  }
  